Abstract
We have observed optical pumping signals from Cs atoms trapped in solid 4 He. While the longitudinal electronic spin relaxation time T 1 is found to be in the range of 1-2 s, the transverse relaxation time T 2 , as inferred from magnetic resonance linewidths has a lower bound of 150 μs, and is determined by magnetic field inhomogeneities. We present a quantitative discussion of how paramagnetic species trapped in solid He might be used in a highly sensitive search for permanent atomic electric dipole moments.
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